internal capsule the fanlike mass of white fibers separating the lentiform nucleus laterally from the head of the caudate nucleus, the dorsal thalamus, and the tail of the caudate nucleus medially. The internal capsule carries both afferent and efferent fibers of the cerebral cortex.

Tenon's capsule

a thin membranous socket that envelops the eyeball from the optic nerve to the ciliary region and allows it to move freely. Tenon's capsule has a smooth inner surface, pierced by vessels and nerves, and fuses with the sheath of the optic nerve and with the sclera. The lower part of the membrane thickens into the suspensory ligament, which attaches to the zygomatic arch and the lacrimal bones. Also called fascia bulbi.

Tenon's capsule

The fibrous membrane that envelops the globe from the margin of the cornea to the optic nerve. Its inner surface is in close contact with the episclera to which it is connected by fine trabeculae. These trabeculae also attach it to the extraocular muscles. The posterior surface of the capsule is in contact with the orbital fat. Anteriorly, it becomes thinner and merges gradually into the subconjunctival connective tissue. Syn. Bonnet's capsule; capsule of the eyeball; fascia bulbi. Seesub-Tenon's injection; ligament of Lockwood.

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